Hi, the only differences between the AAT(115 Bhp) and AEL(140 Bhp) are nozzles and ECU, the pumps and rest of the engine are all the same. However, the automatic models have injector pumps fitted with a 11mm plunger as oposed to the manual ones, wich came with a 10mm plunger. As far as i know, the both pumps looks and behave in the same manner, the difference being that the auto one will flow/inject more fuel per stroke wich equals more power. There is no codding to be made to those pumps and they should be backward compatible ! Difference in letterings means revised items...These cars are Immo 1 and if you keep the instruments clocks and keys, it will start right away. Make shure you bleed the pump/injectors to minimise strain on the battery/starter. Hope this helps.